The phrase "a certain relation between" is correct and usable in written English.
It can be used when discussing connections or associations between two or more entities, concepts, or variables.
Example: "The study aims to explore a certain relation between diet and mental health."
Alternatives: "a specific connection between" or "an identifiable link between".
There was a certain relation between the water activity (aW) of the IL/H2O mixtures and the current density of BOD.
The authors consider an exact reduction relation as a certain relation between potential models of the respective theories.
The problem, according to Russell, is that for this reduction to hold, there must be a certain relation between the properties themselves.
For fast time s and slow time t, we may assume that there exists a certain relation between s and t.
Hence, there is a certain relation between the SNR level and the required source-relay channel quality for cooperation to be beneficial.
He says that "Duty, or Moral Obligation" is strictly speaking neither a quality of an action nor a quality of an agent "but a certain relation between the one and the other..
These relations have their terminal specification and their reason in punishment (which can be a fine, the refusal of communion in confession, the imposition of a certain relations between working forces and leading forces, etc.).
Talking about the "external dimension" of ideas, we made — following Bolzano — intensive usage of a certain relation R between ideas and their objects that is basic in Bolzano's theory of ideas.
The last one is an analogue of a statement that a certain relation (A) holds between three objects (a, b, c).
2) There is not a certain relation for fluctuation between the load behavior and the price, the daily demand of all connected consumers and power scheduling approach is commonly regarded as a game with probability distribution.
As the gradual degradation with same failure mechanism has some regularity in macro, there would be certain relation between an arbitrary point of the degradation process and the correspondent RUL.
